Gearing.



G. 0. LEYOPOLD.

GEARING.

APPLIOATION FILED 00T.19, 1911.

-Patented Mar. 26, 1912;

2 SHEETS-SHEET 2;

cuLumuu. PLANUGRAP cu. WASHINGTON, u. c,

UNITED STATES PATENT OFFICE.

GEORGE O. LEOPOLD, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO NORTH BROS. MFGr 00., 0F PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYL- VAN IA.

GEARING.

Specification of Letters Patent.

Patented Mar. 26, 1912.

Application filed October 19, 1911. Serial No. 655,510.

To all whom it may concern:

Be it known. that I, GEORGE O. LEOPOLD,

a citizen of the United States, residing into lock the spindle to allow the chuck to be opened or closed without turning the gear- 111.

In the accompanying drawings :Figure 1, is a sectional view on the line 11, Fig. 2, of a breast drill illustrating my improved shifting mechanism; Fig. 2, is a view looking in the direction of the arrow, Fig. 1; Fig. 3, is a sectional plan view on the line 3-3, Fig. 2; Fig. 4, is a detached perspective view of the shifter; Fig. 5, is a view showing the shifter located in a diiferent position from that shown in Fig. 1; Fig. 6, is a sectional plan view on the line 66, Fig. 5; Fig. 7, is a detached perspective view of the shifter shown in Fig. 5; Fig. 8, is a vertical sectional view of a modification;'Fig. 9, is a side view of a portion of the deviceshown in Fig. 8; Fig. 10, is a detached perspective view of the shifter shown in Fig. 8; Fig. 11, is a vertical sectional view of another modification; Fig. 12, is a sectional plan view on the line 1.2-12, Fig. 11; and Fig. 13, is a detached perspective view of the shifter shown in Fig. 11.

A. is the frame of a breast drill, in the present instance having a handle B screwed into the cross bar a of the frame.

a is a socket'in the frame which forms a bearing for the spindle G to which is secured the driving gear wheel C. The spindle has an annular groove into which projects a screw a which holds the gear wheel in proper alinement with the other gearing. The spindle and gear wheel can be readily detached by backing off the screw.

C is a handle and secured to the gear wheel in any suitable manner. The gear wheel has an outer row of teeth 0 and an inner row of teeth 0.

Mounted in the frame A is a spindle D on which are loosely mounted the pinions E and F. The teeth of the pinion E mesh with the teeth a of the driving gear wheel C and the teeth of the pinion F mesh with the inner teeth 0 of the wheel C, so that the two pinions are driven at different speeds. In' order to retain the spindle in position in the frame, I form an annular groove (Z in the spindle, slot the pinion F and mount in the slot a key 7 which extends into the groove (Z in the spindle. This key is held in place by a screw f.

In the present instance the gear wheel is held in alinement with the teeth. of the pinions by a presser plate Z) secured to the frame A and, in order to reduce the friction, I form an annular groove 0 in the back of the gear wheel and form a socket in the plate and mount in the socket a ball I), which travels in the groove. As a substitute for this construction the gear wheel may be mounted in the upper part of the frame, as illustrated in Fig. 5, which also acts to keep the teeth of the driving gear wheel in alinement with the teeth of the pinion.

The pinion E has one or more notches e and the pinion F has one or more notches f and the spindle D has a longitudinal slot cl in which is mounted the shifter I; This shifter has a sliding key 2' secured thereto which extends into the notches e and f of the pinions, so as to lock either one or the other of the pinions to the spindle, or, when the key is in themid-position, to lock both pinions to the spindle. In the present in stance the shifter is made of a flat bar, as illustrated in Fig. 4;, having its end bent to form a hook c" which enters a recess in the sliding key 2'. At the lower end of the shifter is a forked projection; 2' which engages the flange h of the shell H. Between the flange of the shell and the end of the frame A is a spring 9 which tends to force the shifter down.

The shell has a diagonal slot h and has notches 72. at three points. The head of a screw in projects from the frame A into the slot and is adapted to the notches, so that by turning the shifter H the head can be brought into line with any .one of the notches and held therein by the spring. When in the upper notch, as illustrated in Figs. 1 and 2, the key i is in the notch e of the pinion E; thus the pinion is locked to the spindle and the spindle will be driven at high speed, the pinion F being loose on the shaft. When the head of the screw 74 is in the lowest notch of the shell H then the key 2' is in the notch f of the pinion F; the pinion F being then looked to the spindle and the pinion E loose thereon, and the spindle will be driven at low speed. hen the shell is shifted to the central position then the key 'will extend partly into the notch of one pinion and partly into the notch of the other pinion, thus locking both pinions to the spindle, and, as the two pin ions are driven at different speeds, the spindle will be locked, enabling the operator to readily open and close the chuck D which is mounted on the end of the spindle. Thus avoiding the necessity of the operator grasping the gears, with the liability of catching his fingers in the gears.

It will be noticed that the key 2' is so mounted on the projection z" of the shifter I that it will rock thereon and each end of the key is beveled. This construction and arrangement makes the key enter the notches more readily than if the construction was rigid.

In the construction illustrated in Fig. 5, a shifter of the same general type is used as illustrated in Fig. 1, with the exception that the shifter extends above the pinions instead of below the pinions, and the shifter bar I, Fig. 7, is coupled to a sleeve 12 having a pin a which extends through a slot a in the frame. The key 2' acts in the same manner as previously described. n is a sleeve having a diagonal slot which form a dust guard and closes the slot a in the frame A.

In the construction shown in Fig. 8, the key 2' is made integral with the shifter I and the pin 2' is made in the form of an integral projection. Located in the slot in the spindle D back of the shifter is a spring 7) which tends to force the key into the slots of the pinions E and F. In this instance the projection i on the shifter I extends through a straight slot 8 in a sleeve 8 secured to the spindle. This shifter is clearly illustrated in the detached view, Fig. 10.

In Figs. 11 and 12, I have illustrated a shifter I having an integral key The lower end of the shifter is constructed in a similar manner to that illustrated in Fig. 1. Instead of the pinions E and F being provided with longitudinal notches they are provided with transverse notches, as illustrated in Figs. 11 and 12, and the key 2' is so shaped as to enter the notch in either pinion, or, when in the m'idposition, to extend into both of the notches.

I claim 1. The combination of a frame; a gear wheel mounted thereon; a spindle mounted in the frame; two pinions meshing with the gear wheel, said spindle having a longitu dinal. slot therein and the pinions having notches; with a key mounted in the slot and arranged to enter the notches of either of the pinions; a shifter attached to or form ing part of the key, said shifter extending into the slot beyond the pinions; and exposed means for operating the shifter to lock either one or the other of the pinions to the spindle or to lock both pinions to the spindle.

2. The combination of a frame; a gear wheel mounted thereon; a spindle mounted in the frame; two pinions loosely mounted on the spindle, each pinion having a notch;

a shifter bar longitudinally movable in the slot of the spindle and having a projection at one end; a key pivotally mounted on the projection and adapted to enter a slot in either pinion; and exposed means for moving the shifter longitudinally.

3. The combination of a frame; a gear wheel mounted thereon; a spindle mounted in the frame; two pinions mounted loosely on the spindle between two parts of the frame and meshing with the gear wheel, said spindle having a longitudinal slot therein, the pinions each having a'longitudinal notch arranged to aline with the slot in the spindle; a shifter bar mounted in the slot of the spindle and having at one end a key arranged to enter the notches in either of the pinions; a shell connected to the shifter bar so that the shifter bar will move with the shell but the shell will be free to turn in dependently of the shifter bar; a spring within the shell, the shell having a spiral slot with notches therein; and a pin on the frame extending into the slot and adapted to rest in the notches to hold the shifter bar in the position to which it is adjusted.

4:. The combination of a frame having a socket therein; a gear wheel having a spindle secured thereto and having its bearing in the socket, said spindle having an annu lar groove therein, and a screw mounted in the frame and extending into the groove to hold the spindle in position; a second spindle mounted in the frame; and a pinion thereon meshing with the teeth of the gear wheel.

5. The combination of a frame; a gear wheel mounted thereon; a spindle mounted in the frame; two pinions loosely mounted on the spindle and having a longitudinal slot therein; a shifter bar mounted in the slot; a key carried by the shifter bar and arranged to lock either of the pinions to the spindle, said spindle having an annular groove therein; a key in one of the pinions extending into the groove; and a screw for confining the key in position.

6. The combination of a frame; a gear wheel mounted thereon; a spindle mounted in the frame; two pinions loosely mounted on the spindle, said spindle having a longitudinal slot; a shifter bar in the slot; a key carried by the shifter bar arranged to lock either of the pinions to the spindle; said shifter bar having a projection; a frame having an opening through which the projection extends; and a dust sleeve having a spiral slot therein, the pin extending through the slot in the dust sleeve and the sleeve closing the slot in the spindle.-

7. The combination of a frame, a gear wheel mounted thereon; a spindle mounted in the frame; two pinions loosely mounted on the spindle, the spindle having a longitudinal slot; a shifter bar mounted in the slot; a key carried by the shifter bar arranged to engage either one of thepinions, the shifter bar having a forked projection at the opposite end; and an exposed shifting 15 device located between the the shifter bar.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

GEORGE O. LEOPOLD.

Witnesses: I

WM. E. SHUPE, WM. A. BARR.

projections of Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). 0. 

